Order
What the customer ordered and how it prints.
Filament
Use the slicer's estimate for one full plate, supports and purge included.
Print time and power
Print time is per full plate.
Average draw while printing. Most desktop printers use 100 to 150 W.
Machine wear
Spreads the printer's price over the hours it will print.
Nozzles, belts, build sheets and other wear parts, per print hour.
Labour
Your time, at the rate you pay yourself.
Slicing, plate prep and taking parts off.
Support removal, sanding, assembly, packing.
Failures and overhead
Costs that don't show up in the slicer.
Adds this share of the material, power and wear for reprints.
Rent, software, marketing, as a share of the cost.
Per item: box, bag, filler, label.
Per order: shipping supplies, listing fees.
Pricing
How you turn the cost into a price.
Markup is profit as a share of your cost: 100% doubles it.